take a popbottle and cut it dow a bit lets say to about 8inches. drill some holes in it close to the top, you have to fassen some egg crate to the bottle. next put some rubble in it for weight and then place some food in the trap. wait till fish swims in and lift the lid in a backward manner so it will close tightly to the cut edge. then you just have to keep the egg crate in place till you can get your hand down there. this may take a while but it works. I use the rectangle shape juice bottles they work better and alot cheeper than spending 60 and up for a comercially built one. there are other ways to build a bottle trap.